write a matrix to a text file

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Arash
Arash 2011-6-22
I'd like to write a matrix into a text file, but I don't want elements with NaN value appear in the file, instead I want an empty space for each NaN value, here is a part of the matrix:
  1. 1 NaN NaN NaN NaN
  2. 3 4 4 NaN NaN
  3. 6 1 NaN NaN NaN
  4. 2 2 NaN NaN NaN
  5. 4 4 5 NaN NaN
  6. 6 2 3 2 NaN
thanks!
  1 个评论
Walter Roberson
Walter Roberson 2011-6-22
Are the NaN certain to be at the end of the line? If not then a different method would have to be used.

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采纳的回答

Laura Proctor
Laura Proctor 2011-6-22
I wrote the following code which writes it line by line. Do you need the line breaks to be as they are in the original matrix? If not, then a FOR loop wouldn't be necessary.
A = [ 1 NaN NaN NaN NaN
3 4 4 NaN NaN
6 1 NaN NaN NaN
2 2 NaN NaN NaN
4 4 5 NaN NaN
6 2 3 2 NaN ]
fid = fopen('stuff.txt','w+');
for idx = 1:size(A,1)
line = A(idx,~isnan(A(idx,:))); % creates the line of data without NaNs
fprintf(fid,[repmat('%d ',1,length(line)),'\n'],line);
end
fclose(fid);
  2 个评论
Arash
Arash 2011-6-22
thanks! could you please explain a little bit about "[" on the line: fprintf(fid,[repmat('%d ',1,length(line)),'\n'],line);
what exactly brackets do?
Walter Roberson
Walter Roberson 2011-6-22
The [] are horizontal concatenation in this contexts. Building up a string by parts.

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